Aerial wetting contact angle measurement using confocal microscopy
Aerial wetting contact angle measurement using confocal microscopy
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DOI：
10.1088/0957-0233/27/12/125202
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发表时间：
2016-10
影响因子：
2.4
通讯作者：
Jacob W. Chesna;Bob F. Wiedmaier;Jinlin Wang;A. Samara;R. Leach;T. Her;S. Smith
中科院分区：
文献类型：
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作者：
Jacob W. Chesna;Bob F. Wiedmaier;Jinlin Wang;A. Samara;R. Leach;T. Her;S. Smith
提出了一种使用共焦技术在空中获取固着液滴的润湿接触角的方法，以测量沉积在平面上的液滴的半径和高度。对于直径小于1 mm的水滴，该方法的重复性通常小于0.25°，并且通常小于0.1°。为了评估该方法的准确度，开发了仪器不确定度预算，其预测对于接触角为110°的直径为1 mm的水滴的组合不确定度为0.91°。对于直径小于1 mm且接触角在15°和160°之间的液滴，这些液滴接近球形，并且可以以小于1%的误差解析地计算它们的接触角。对于较大的液滴，需要考虑重力变形。
A method is presented in which the wetting contact angle of a sessile drop is acquired aerially using confocal techniques to measure the radius and the height of a droplet deposited on a planar surface. The repeatability of this method is typically less than 0.25°, and often less than 0.1°, for droplet diameters less than 1 mm. To evaluate accuracy of this method, an instrument uncertainty budget is developed, which predicts a combined uncertainty of 0.91° for a 1 mm diameter water droplet with a contact angle of 110°. For droplets having diameters less than 1 mm and contact angles between 15° and 160°, these droplets approach spherical shape and their contact angles can be computed analytically with less than 1% error. For larger droplets, gravitational deformation needs to be considered.